Bailroad-car wheel



l 1v1. PHE-LAN.

y Car Wheel. No. 18,767. PatentefLDec. 1. 1857.

UNITED STATES PATENT OFFICE.

MICHAEL PHELAN, OF BRIDGEVVATER, PENNSYLVANIA.

RAILROAD-CAR WHEEL.

Specification of Letters Patent No. 18,767, dated December 1, 1857.

.To all whom it may concern:

Be it known that I, MICHAEL PHELAN, of the borough of Bridgewater, in the county of Beaver' and State of Pennsylvania, have invented a new Improved and Useful Mode of Making and Casting Railroad- Car Theelsg and I do hereby declare that t-he following is a full and exact description thereof, reference being had to the accompanying drawings and letters of reference marked thereon.

A, A, in the plan represents the trontplate of the Wheel, attached to the tread B, B, and hub C, C, the said front plate A, A, being a broken line of shrinkage on reversed sines D, D, D, six in the diameter, three in the one-half diameter of the Wheel, and relieving the Wheel face of the natural strain by shrinkage or contraction in cooling, and in use, and thereby avoiding the usual continued strain. The curved projections, or combinations of arches marked f, attached to and arising from the back ot' the front plate A, A, and extending from hub E to the flanch on tread g, g, said projections f forming fourteen arms of reversed sines on four different points, marked h, it, z, Il., and extending from hub E to lanch g, and tread B, thus a corresponding provision for and relieving the contraction and shrinkage at all points in the curved projections f conforming to and in exact conformity With the front plate A, A, the curved projections f, forming a combination or arches by means of their connecting braces c', c', z', c', each supporting and bracing the other, the Whole resulting in and giving a lightness and strength not heretofore attained.

lVhat I claim as my invention and desire to secure by Letters Patent is:

The curved projections on the disk of four reversed sines forming arms in combination with braces and a series of arches so arranged on the disk or front plate of four reversed sines so as to give a uniform spring to all parts of the casting in cooling, relieving the Wheel from all contingent strain, and giving the greatest possible strength for the Weight of iron used and for the application of said curved projections and combination of arches and braces Without a front plate in casting car Wheels, as described in the specifications and letters.

MICHAEL PHELAN. lVitnesses:

Jos. ToMLINsoN, H, S. DONALDSON, 

